Dust removal device for roadway tunneling of rock drilling equipment

Abstract

The invention relates to the technical field of mining dust removal devices, in particular to a dust removal device for rock drilling equipment roadway tunneling, which comprises a casing, a filter cartridge, a centrifugal fan and a pulse back flushing unit, the centrifugal fan and the pulse back flushing unit are mounted on the casing, the casing is divided into a suction cavity and a filter cavity by a partition plate, and the filter cartridge is mounted below the partition plate and vertically extends in the filter cavity. A back flushing mechanism capable of lifting in a reciprocating manner is arranged in the filter cartridge and comprises an annular flow guide box and a plurality of nozzles uniformly distributed on the peripheral side of the annular flow guide box. The reverse blowing mechanism is used for performing reverse blowing cleaning compensation on the filter cartridge in a gap between two times of pulse reverse blowing, a composite working mechanism of periodic main pulse and intermittent continuous auxiliary reverse blowing is formed, dust on the surface of the filter cartridge and a shallow layer of filter holes can be removed in real time, the dust removal difficulty of subsequent pulse reverse blowing is reduced, it is ensured that the air permeability of the filter cartridge is stable, and the service life of the filter cartridge is prolonged. And the ash removal capacity is better matched with the dust deposition rate, and the situation that the dust removal efficiency is reduced due to intermittent cleaning deficiency is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of mine dust removal devices, and particularly to a dust removal device for roadway tunneling of rock drilling equipment. Background Technique

[0002] Roadway tunneling is a key link in excavation operations in underground rock or soil during mine roadway construction and mine exploitation projects. In roadway tunneling, a rock drilling jumbo is used to drill holes in the rock mass to prepare for blasting or the installation of anchor bolts and cables. Rock drilling generates a large amount of dust. To ensure visibility and air quality at the construction site, dust suppression treatment needs to be carried out on site. Traditional spray-type dust suppression devices will leave sewage on site, so most choose dust collection equipment to achieve dust removal. The cartridge filter dust collector uses a fan to generate negative pressure to suck dust into the interior, and then uses cartridges to filter and separate the dust. During the dust removal process, dust is easily accumulated from the outside and drilled into the holes on the cartridges, causing blockage. Usually, a pulse backflush unit is equipped on the dust collector to pulse the interior of the cartridges to achieve backflush cleaning of the cartridges.

[0003] In the high-dust environment of roadway tunneling, if the pulse backflush unit operates continuously, it will cause a sharp increase in the consumption of compressed air, leading to insufficient air source pressure. At the same time, if the core components operate continuously at high frequency, they are prone to fatigue wear, significantly increasing the risk of failure. In addition, continuous backflushing will damage the stability of the negative pressure suction air flow, resulting in a decrease in dust removal efficiency or even dust backflow. Therefore, the pulse backflush system is usually designed with a periodic intermittent operation mechanism to achieve a dynamic balance between ash cleaning and filtering functions by setting a reasonable time interval. However, in the roadway tunneling site, the amount of dust is large, and the periodic pulse backflush mechanism has the problems of incomplete ash cleaning and insufficient adaptability, resulting in the rate of dust deposition on the outside of the cartridges being much higher than the ash cleaning ability of the backflush cycle, affecting the dust removal effect. Summary of the Invention

[0004] The purpose of the present invention is to provide a dust removal device for roadway tunneling of rock drilling equipment with good dust removal effect to solve the technical problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solutions.

[0006] A dust removal device for roadway tunneling of rock drilling equipment includes a machine shell, cartridges, a centrifugal fan and a pulse backflush unit installed on the machine shell. The interior of the machine shell is divided into a suction chamber and a filtration chamber by a partition. The cartridges are installed below the partition and vertically extend in the filtration chamber. An anti-blowing mechanism capable of reciprocating up and down is provided inside the cartridges. The anti-blowing mechanism includes an annular diversion box and a plurality of nozzles evenly distributed on the outer peripheral side of the annular diversion box, which is used to generate an anti-blowing air flow to backflush and clean the cartridges during the interval between two pulse cleanings of the pulse backflush unit.

[0007] The outer sleeve of the filter cartridge is provided with a protective cover which can be raised and lowered synchronously with the back-blowing mechanism to shield and protect the back-blowing airflow. An annular ash discharge channel with an opening facing downward is formed between the protective cover and the outer wall of the filter cartridge. The back-blowing airflow can pass through the filter holes on the filter cartridge and enter the ash discharge channel, flush out and carry the dust deposited in the filter holes to flow toward the ash outlet at the bottom of the casing.

[0008] The side of the casing is provided with an exhaust port which is communicated with the suction chamber. The exhaust port is connected with an air outlet pipe, and the end of the air outlet pipe is communicated with a ventilation duct arranged in the lane.

[0009] Preferably, a first driving mechanism is provided in the filter cartridge, and the back-blowing mechanism also includes a guide device and a linkage mechanism. The annular guide box is sleeved outside the first driving mechanism. The first driving mechanism can drive the annular guide box to be raised and lowered and adjusted. The annular guide box consists of an annular shell with a horizontal U-shaped cross-section and an opening facing the periphery, and a rotating bushing rotatably installed on the opening of the annular shell. An annular guide cavity is formed between the annular shell and the rotating bushing.

[0010] A number of guide devices are evenly distributed on the bottom of the annular shell, and the nozzles are arranged in a circular array on the rotating bushing. The guide devices draw air into the annular guide cavity and spray it out from each nozzle to form a backblowing airflow. A linkage mechanism is jointly provided on the first drive mechanism and the annular shell for linkage with the rotation adjustment of the rotating bushing when the annular guide box is raised or lowered.

[0011] Preferably, the first driving mechanism includes a first rodless cylinder and a connecting arm. The first rodless cylinder is vertically arranged in the filter cartridge, and the bottom is fixed to the bottom sealing end of the filter cartridge. The connecting arm is fixed to the side of the first movable seat on the first rodless cylinder and fixed to the inner edge wall of the annular shell.

[0012] Preferably, the linkage mechanism includes a shaft, gear A, a gear ring, gear B and a rack. A bracket is fixed on the top of the annular shell, and the shaft is rotatably installed on the bracket. Gear A is fixed at one end of the shaft and gear B is fixed at the other end. The gear ring is fixed at the top of the rotating bushing and meshes with gear A. The rack is vertically fixed on the side of the seat plate of the first rodless cylinder and meshes with gear B.

[0013] Preferably, a guide plate is fixed on one side of each nozzle on the outer side wall of the rotating bushing, and each nozzle extends radially along the rotating bushing. The guide plate extends obliquely relative to the nozzle to guide the backblowing airflow obliquely to the filter cartridge.

[0014] Preferably, the nozzle consists of a tapered portion fixed on a rotating sleeve and an ejection portion located at the end of the tapered portion. The aperture of the ejection portion is smaller than the minimum aperture in the tapered portion. A focusing hood is fixed on the guide plate. A focusing cavity is formed between the focusing hood and the guide plate. The back-blowing airflow blown out by the ejection portion can enter the focusing cavity accordingly. The span of the focusing cavity in the horizontal direction is smaller as it is closer to the filter cartridge.

[0015] Preferably, the diversion device includes an installation cylinder and a suction fan. The diversion device is fixed to the bottom of the annular shell and is communicated with the annular diversion cavity. A suction fan is installed in each installation cylinder, and a filter screen is arranged below the suction fan in each installation cylinder.

[0016] Preferably, the cross-section of the protective cover is in the shape of a vertical part at the bottom and an arc part at the top. One end of the arc part is connected to the top of the vertical part, and the other end of the arc part is movably attached to the outer wall of the filter cartridge.

[0017] Preferably, a second driving mechanism for driving the lifting and adjustment of the protective cover is provided in the filtering cavity. The second driving mechanism includes a pair of U-shaped frames each composed of a suspension and two mounting arms, and a second rodless cylinder vertically extending and installed on the two U-shaped frames. The two U-shaped frames are both fixed to the inner wall of the machine shell, and the protective cover is fixedly connected to the second moving seat on the second rodless cylinder.

[0018] Preferably, a side opening communicating with the filtering cavity is provided on the side of the machine shell. A door panel for blocking the side opening is hingedly installed on the side of the machine shell, and the door panel can be locked by a buckle lock arranged on the machine shell.

[0019] A dust collecting pipe is connected to the ash inlet on the side of the machine shell that communicates with the filtering cavity, and a dust collecting cover is provided at the end of the dust collecting pipe.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0021] The present invention is provided with a backwashing mechanism that performs backwashing work during the interval between two adjacent pulse operations of the pulse backwashing unit. The backwashing mechanism backwashes and cleans the filter cartridge, forming a composite working mechanism of periodic main pulses and continuous auxiliary backwashing during the intermittent period. It can timely remove the dust on the surface of the filter cartridge and in the shallow layer of the filter holes, avoid the dust from being compacted and adhered due to long-term retention, reduce the difficulty of subsequent pulse backwashing for dust cleaning, ensure the stable air permeability of the filter cartridge, break the blank period of complete lack of cleaning during the pulse interval, make the dust cleaning ability more matched with the dust deposition rate, and avoid the reduction of dust removal efficiency caused by the lack of cleaning during the intermittent period.

[0022] The present invention is provided with a protective cover that can shield and protect the backwashing airflow, reduce the interference and turbulence of the dust collecting airflow, avoid energy dispersion. The protective cover is lifted and lowered synchronously with the backwashing mechanism under the drive of the second driving mechanism, realizing segmented dust cleaning and dynamic isolation, adapting to the full length range of the filter cartridge. The dust discharging flow channel formed by the protective cover and the filter cartridge can guide the airflow to discharge downward, and the dust is accelerated to settle to the bottom ash outlet by gravity and the drag force of the airflow. The arc surface at its top reduces dust accumulation, achieving multiple benefits at once.

[0023] In the present invention, by installing an inclined and extended deflector plate on one side of the nozzle on the side surface of the rotating bushing, the backflush air flow is deflected into a fan-shaped diffusion flow field, expanding the air flow coverage range of a single nozzle. Combining lifting and rotation, the backflush air flow is complementary in the horizontal and vertical directions, avoiding backflush dead angles, improving the cleaning effect, and the inclined arrangement of the deflector plate causes the backflush air flow to blow obliquely towards the filter cartridge, combined with rotation to produce a combined shearing and impact effect on the dust, destroying the adhesion between the dust and the filter material and reducing residues.

[0024] The present invention uses the converging cavity formed by the converging hood and the deflector plate to constrain and guide the air flow, improving the energy concentration rate. After the first-stage diameter reduction of the tapered part and the second-stage diameter reduction and acceleration of the converging cavity, the energy of the backflush air flow is strengthened, enhancing the impact ability on the dust on the filter cartridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the internal structure of the housing in the present invention; Figure 3 is a schematic diagram of a partial structure on the surface of the housing in the present invention; Figure 4 is Figure 1 a schematic diagram of the structure shown with the housing and the accessories on the housing omitted; Figure 5 is Figure 4 a schematic sectional view of the structure shown; Figure 6 is a schematic diagram of the installation of the shield structure in the present invention; Figure 7 is a schematic diagram of the internal structure of the filter cartridge in the present invention; Figure 8 is Figure 7 a schematic diagram of a partial structure of the structure shown; Figure 9 is Figure 8 a schematic diagram of another perspective of the structure shown; Figure 10 is Figure 8 a schematic sectional view of the structure shown; Figure 11 is Figure 8 a schematic sectional view of the structure shown; Figure 12 is a schematic diagram of the linkage mechanism structure in the present invention; Figure 13 is a schematic diagram of the deflector plate and the converging hood structure in the present invention; Figure 14 is a schematic diagram of the layout of the deflector plate and the nozzle structure in the present invention; Figure 15 is a schematic sectional view of the shield in the present invention; Figure 16 Schematic diagram of the flow direction of the backflush air flow generated by the backflush mechanism.

[0026] In the figure: 01, centrifugal fan; 02, pulse backflush unit; 1, housing; 101, side opening; 102, door panel; 103, buckle lock; 11, partition; 12, suction chamber; 13, filtration chamber; 14, ash inlet; 141, dust collection pipe; 142, dust collection hood; 15, exhaust port; 151, air outlet pipe; 16, ash outlet; 2, filter cartridge; 3, first drive mechanism; 31, first rodless cylinder; 311, first moving seat; 32, connecting arm; 4, backflush mechanism; 41, annular flow guide box; 411, annular housing; 412, rotating bushing; 413, annular flow guide cavity; 42, nozzle; 421, tapered portion; 422, ejection portion; 43, flow guide device; 431, mounting cylinder; 432, suction fan; 433, filter screen; 44, linkage mechanism; 441, bracket; 442, shaft rod; 443, gear A; 444, toothed ring; 445, gear B; 446, rack; 45, flow guide plate; 46, flow concentrating hood; 461, flow concentrating cavity; 5, second drive mechanism; 51, mounting arm; 52, suspension; 53, second rodless cylinder; 531, second moving seat; 6, protective cover; 601, vertical portion; 602, arc portion; 61, ash discharge flow channel. Detailed implementation manners

[0027] Please refer to Figures 1 - 16 , the present invention provides a dust removal device for roadway tunneling of a rock drilling device. The embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.

[0028] The dust removal device includes a housing 1, a filter cartridge 2, a centrifugal fan 01 and a pulse backflush unit 02 installed on the housing 1. The interior of the housing 1 is divided into a suction chamber 12 and a filtration chamber 13 by a partition 11. The filter cartridge 2 is installed below the partition 11 and extends vertically in the filtration chamber 13. In addition, the centrifugal fan 01 is installed on the top of the housing 1, and the impeller part is located in the suction chamber 12. The side of the housing 1 has an exhaust port 15 communicating with the suction chamber 12 and an ash inlet 14 communicating with the filtration chamber 13. The pulse backflush unit 02 is installed on the outer side of the housing 1, and a part of the pulse backflush unit 02 extends into the suction chamber 12 and is vertically downward aligned with the top of the filter cartridge 2. Among them, both the centrifugal fan 01 and the pulse backflush unit 02 adopt existing technologies, and the specific structures and working principles will not be described in detail in this application.

[0029] In addition, the bottom of the housing 1 has an ash outlet 16 communicating with the bottom of the filtration chamber 13. A dust collection pipe 141 is connected to the ash inlet 14, and a dust collection hood 142 is provided at the end of the dust collection pipe 141.

[0030] The side of the casing 1 has an exhaust port 15 that penetrates the suction chamber 12. The exhaust port 15 is connected to an air outlet pipe 151. The end of the air outlet pipe 151 is connected to an interface on the ventilation duct arranged in the alley through a flange (not shown in the figure). The clean air discharged after dust removal flows into the air outlet pipe 151 through the exhaust port 15 and is transported to the ventilation duct through the air outlet pipe 151 as ventilation compensation.

[0031] The ventilation system installed in the alley is used to transport fresh air. The existing technology is adopted. The ventilation pipe is a conventional component in the ventilation system and is not specifically shown in the accompanying drawings. The dust removal device and the ventilation system are closely coordinated to realize the coordinated operation mechanism of the dust removal device and the ventilation system.

[0032] The casing 1 is arranged on the drilling trolley, and the dust collecting hood 142 is arranged on the front side of the drilling trolley. The dust collecting hood 142 is connected to the ash inlet 14 by means of the dust collecting pipe 141. During the drilling operation, the centrifugal fan 01 generates negative pressure, and the dust generated at the drill bit is sucked into the filter chamber 13 through the dust collecting hood 142, the dust collecting pipe 141 and the ash inlet 14 in turn. The air passes through the filter holes on the filter cartridge 2 and enters the suction chamber 12, and is finally discharged from the exhaust port 15. The dust and particulate matter are filtered out by the filter cartridge 2, and settle downward, and are finally discharged from the ash outlet 16, thereby realizing dust removal during tunnel excavation, avoiding the random dispersion of dust, and ensuring the visibility and air quality on site.

[0033] Among them, interfaces that cooperate with the end flange of the air outlet pipe 151 are arranged at intervals on the ventilation pipe along the excavation direction. As the excavation progresses, the end flange of the air outlet pipe 151 can be adjusted to connect with the interface at the next position to cooperate with the advancement of excavation, and the remaining interfaces not connected to the air outlet pipe 151 are blocked by covers. In addition, the air outlet pipe 151 adopts a hose to adapt to the position movement of engineering vehicles in local areas within the tunnel.

[0034] Secondly, by installing a spray box (not shown in the figure) at the bottom of the ash outlet 16, the dust is collected and then sprayed and settled in the spray box to prevent sewage from flowing freely on site.

[0035] See also Figure 5 and Figure 7 A back-blowing mechanism 4 capable of reciprocating lifting is provided in the filter cartridge 2. The back-blowing mechanism 4 comprises an annular guide box 41, a plurality of nozzles 42 evenly distributed on the outer peripheral side of the annular guide box 41, and a guide device 43 evenly distributed on the bottom of the annular guide box 41. Air is sucked into the annular guide box 41 through the guide device 43, and is blown out to the periphery by the nozzles 42, forming a back-blowing airflow that blows on the filter cartridge 2, so that the filter holes on the filter cartridge 2 can be back-blown and cleaned.

[0036] Specifically, the pulse backblowing unit 02 works periodically. In the interval between two adjacent pulse operations of the pulse backblowing unit 02, the backblowing mechanism 4 backblows and cleans the filter cartridge 2, forming a composite working mechanism of periodic main pulses and continuous auxiliary backblowing in the intermittent period. The dust on the surface of the filter cartridge 2 and the shallow layer of the filter pores can be removed in real time to avoid compaction and adhesion of dust due to long-term retention, reduce the difficulty of cleaning by subsequent pulse backblowing, ensure the stability of the air permeability of the filter cartridge 2, break the blank period of no cleaning during the pulse interval, make the cleaning capacity more matched with the dust deposition rate, and avoid the decrease in dust removal efficiency due to the lack of cleaning in the intermittent period.

[0037] like Figures 7 - 12 As shown, a first driving mechanism 3 is provided in the filter cartridge 2, and an annular guide box 41 is sleeved on the outside of the first driving mechanism 3. The first driving mechanism 3 can drive the annular guide box 41 to be raised and lowered. The first driving mechanism 3 can drive the back-blowing mechanism 4 to be raised and lowered as a whole in the filter cartridge 2 to ensure that the back-blowing range is sufficient to cover the height of the filter cartridge 2.

[0038] Furthermore, the annular guide box 41 is composed of an annular shell 411 with a horizontal U-shaped cross-section and an opening facing the periphery, and a rotating sleeve 412 rotatably installed on the opening of the annular shell 411. An annular guide cavity 413 is formed between the annular shell 411 and the rotating sleeve 412. A plurality of guide devices 43 are evenly distributed on the bottom of the annular shell 411. The nozzles 42 are arranged in an annular array on the rotating sleeve 412. The guide devices 43 are evenly distributed on the bottom of the annular shell 411. The guide tubes of the guide devices 43 and the nozzles 42 are realized through the annular guide cavity 413. A linkage mechanism 44 is commonly provided on the first driving mechanism 3 and the annular shell 411 for linkage rotation adjustment of the rotating sleeve 412 when the annular guide box 41 is raised or lowered.

[0039] like Figure 8 As shown, the first driving mechanism 3 includes a first rodless cylinder 31 and a connecting arm 32. The first rodless cylinder 31 is vertically arranged in the filter cartridge 2, and the bottom is fixed to the bottom sealing end of the filter cartridge 2. The connecting arm 32 is fixed to the side of the first movable seat 311 on the first rodless cylinder 31, and is fixed to the inner edge wall of the annular shell 411. Through the operation of the first rodless cylinder 31, the first movable seat 311 thereon can be driven to rise and fall. Under the fixed connection action of the connecting arm 32, the annular shell 411 can be driven to rise and fall synchronously, thereby providing a stable linear drive for the lifting and lowering adjustment of the back-blowing mechanism 4.

[0040] like Figure 9 and Figure 10As shown, the flow guiding device 43 includes an installation cylinder 431 and a suction fan 432. The flow guiding device 43 is fixed to the bottom of the annular shell 411 and is communicated with the annular flow guiding cavity 413. A suction fan 432 is installed in each installation cylinder 431, and a filter screen 433 is arranged below the suction fan 432 in each installation cylinder 431. By the operation of the suction fan 432, external air is sucked into the installation cylinder 431 and introduced into the annular flow guiding cavity 413, which can provide a gas source for the back blowing air flow ejected by the nozzle 42.

[0041] As Figure 12 shown, the linkage mechanism 44 includes a shaft rod 442, a gear A 443, a toothed ring 444, a gear B 445 and a rack 446. A bracket 441 is fixed to the top of the annular shell 411. The shaft rod 442 is rotatably installed in the bracket 441 in a penetrating manner. A gear A 443 is fixed to one end of the shaft rod 442, and a gear B 445 is fixed to the other end. The toothed ring 444 is fixed to the top of the rotating bushing 412 and is correspondingly meshed with the gear A 443. The rack 446 is vertically fixed to the side of the seat plate of the first rodless cylinder 31 and is correspondingly meshed with the gear B 445.

[0042] During the lifting and lowering process of the annular flow guiding box 41, the rack 446 meshes with and drives the gear B 445, driving the shaft rod 442 to rotate, and then driving the gear A 443 to rotate. The rotating gear A 443 meshes with and drives the toothed ring 444, driving the rotating bushing 412 to rotate. Thus, during the lifting and lowering process of the annular flow guiding box 41, the rotating bushing 412 and the nozzle 42 can be linked to rotate, achieving a rotating backwashing effect, so that the back blowing air flows ejected by the nozzle 42 complement each other in the horizontal direction to ensure that the circumferential direction of the filter cartridge 2 can be covered.

[0043] Please refer to Figures 8 - 13 , a flow guiding plate 45 is fixed to one side of each nozzle 42 on the outer side wall of the rotating bushing 412. Each nozzle 42 extends radially along the rotating bushing 412, and the flow guiding plate 45 extends obliquely relative to the nozzle 42 to obliquely guide the back blowing air flow to the filter cartridge 2. As Figure 14 shown, the included angle between the flow guiding plate 45 and the nozzle 42 is defined as R. Among them, 5° ≤ R ≤ 15°. In this application, R is preferably 10°.

[0044] Since the gas range ejected by the nozzle 42 is limited, by installing a flow guiding plate 45 that extends obliquely relative to the nozzle 42 on one side of each nozzle 42 on the side surface of the rotating bushing 412. As Figure 16As shown, where the dashed arrow indicates the flow direction of the backflush air current. After the backflush air current impacts on the deflector plate 45, it will be deflected and dispersed by the deflector plate 45, forming a fan-shaped diffusion flow field, so that the backflush air current is no longer limited to the direct injection range of the nozzle 42, effectively improving the coverage range of the air current ejected by a single nozzle 42. Combining the lifting and rotating effects, on the basis that the backflush air currents complement each other horizontally, they further complement each other vertically, so that the backflush range can sufficiently cover most areas of the filter cartridge 2, avoiding the existence of backflush dead angles and improving the cleaning effect on the filter cartridge 2.

[0045] And the deflector plate 45 is arranged slightly inclined relative to the nozzle 42, intercepting and guiding the backflush air current and blowing it obliquely on the filter cartridge 2. Combining the rotating effect, it produces a combined effect of shearing and impact on the dust deposited on the outer surface of the filter cartridge 2 and in the filter holes thereon. Compared with vertical jet blowing, it can more effectively break the adhesion between the dust and the filter material, significantly improving the dust stripping effect and reducing dust residue.

[0046] In addition, as Figure 13 and Figure 14 shown, the nozzle 42 is composed of a tapered portion 421 fixed on the rotating bushing 412 and an ejection portion 422 located at the end of the tapered portion 421. The aperture of the ejection portion 422 is smaller than the minimum aperture in the tapered portion 421. Converging hoods 46 are fixed on the deflector plate 45, and a converging channel 461 is formed between the converging hood 46 and the deflector plate 45. The backflush air current blown out by the ejection portion 422 can correspondingly enter the converging channel 461, and the span of the converging channel 461 in the horizontal direction is smaller closer to the filter cartridge 2.

[0047] Utilizing the converging channel 461 formed between the converging hood 46 and the deflector plate 45, it improves the capture and guiding effect on the air current, avoids the air current directly impacting the surface of the deflector plate 45 and diffusing disorderly. Through channel constraint, it effectively improves the air current energy concentration rate, ensures that the backflush air current acts on the filter cartridge 2 at a directed inclined angle accurately, reduces air current scattering loss. Through the design of the converging channel 461 with a smaller span in the horizontal direction closer to the filter cartridge 2 and the tapered portion 421 with a smaller aperture towards the ejection portion 422 side, it has an effect of enhancing the backflush air current. The air current undergoes primary diameter reduction and acceleration through the tapered portion 421, and then undergoes secondary diameter reduction and acceleration through the converging channel 461. The energy of the backflush air current is effectively strengthened. With the synergistic effect of multiple functions, it realizes the constraint and diversion of the backflush air current and secondary diameter reduction and acceleration, improving the impact ability on the dust on the filter cartridge 2.

[0048] Please refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 6 , a protective cover 6 that can be lifted and lowered synchronously with the backflush mechanism 4 is sleeved outside the filter cartridge 2, which is used for shielding and protecting the backflush air current. As Figure 15As shown, the cross-section of the shield 6 is in the shape of a vertical part 601 at the bottom and an arc part 602 at the top. One end of the arc part 602 is connected to the top of the vertical part 601, and the other end of the arc part 602 is movably attached to the outer wall of the filter cartridge 2. As Figure 16 shown, the dotted arrow in the figure indicates the flow direction of the backflush air flow. An annular ash discharge channel 61 with an opening downward is formed between the shield 6 and the outer wall of the filter cartridge 2. The backflush air flow blown out from the converging channel 461 passes through the filter holes on the filter cartridge 2 and enters the ash discharge channel 61, which can flush out and carry the dust deposited on the filter cartridge 2 and in the filter holes of the filter cartridge 2 and flow towards the ash outlet 16 at the bottom of the housing 1.

[0049] The shield 6 can shield and protect the backflush air flow, reduce the interference and turbulence of the dust collection air flow on the backflush air flow, avoid the energy dispersion caused by the interference of the backflush air flow, and under the driving action of the second driving mechanism 5, the shield 6 moves up and down synchronously with the backflush mechanism 4, realizing a combined working mode of segmented dust cleaning and dynamic isolation, ensuring adaptation to the full length range of the filter cartridge 2. The ash discharge channel 61 formed between the shield 6 and the filter cartridge 2 can guide the air flow downward for discharge, realizing the dual action of gravity and air flow drag force, making the discharged dust move downward at an accelerated speed, directly guiding to the ash outlet 16 at the bottom of the dust collector, promoting the sedimentation and discharge of the dust. In addition, the arc surface at the top of the shield 6 can reduce the retention and accumulation of dust, achieving multiple benefits.

[0050] Among them, a second driving mechanism 5 for driving the lifting and adjustment of the shield 6 is provided in the filtration chamber 13. The second driving mechanism 5 includes a pair of U-shaped frames each composed of a suspension 52 and two mounting arms 51, and a second rodless cylinder 53 vertically extending and installed on the two U-shaped frames. The two U-shaped frames are both fixed on the inner wall of the housing 1. The shield 6 is fixedly connected to the second moving seat 531 on the second rodless cylinder 53. The second rodless cylinder 53 is vertically installed in the filtration chamber 13 by using the U-shaped frame composed of the suspension 52 and the mounting arms 51. By the operation of the second rodless cylinder 53, the second moving seat 531 thereon is driven to move up and down, and then the shield 6 is driven to move up and down simultaneously. Moreover, the second moving seat 531 moves up and down synchronously with the first moving seat 311, thus ensuring that the shield 6 and the backflush mechanism 4 move up and down synchronously.

[0051] As Figure 3 shown, a side opening 101 communicating with the filtration chamber 13 is provided on the side of the housing 1. A door panel 102 for blocking the side opening 101 is hingedly installed on the side of the housing 1. The door panel 102 can be locked by a buckle lock 103 arranged on the housing 1. When the door panel 102 is locked by the buckle lock 103 to block the side opening 101, it is convenient for the system to perform dust collection work. When the door panel 102 is opened, it is convenient to perform maintenance and cleaning work on the components inside the housing 1 through the side opening 101.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A dust removal device for roadway tunneling of a rock drilling equipment, comprising a machine shell (1), a filter cartridge (2), a centrifugal fan (01) and a pulse backwashing unit (02) installed on the machine shell (1). The interior of the machine shell (1) is separated into a suction chamber (12) and a filtration chamber (13) by a partition plate (11). The filter cartridge (2) is installed below the partition plate (11) and extends vertically in the filtration chamber (13). It is characterized in that: An anti-blowing mechanism (4) capable of reciprocating up and down is provided in the filter cartridge (2). The anti-blowing mechanism (4) includes an annular diversion box (41) and a plurality of nozzles (42) evenly distributed on the outer peripheral side of the annular diversion box (41), and is used for generating an anti-blowing air flow to perform anti-blowing cleaning on the filter cartridge (2) during the interval between two pulse cleanings of the pulse backwashing unit (02); A protective cover (6) capable of lifting and lowering synchronously with the anti-blowing mechanism (4) is sleeved outside the filter cartridge (2) for shielding and protecting the anti-blowing air flow; An annular ash discharge channel (61) with an opening facing downwards is formed between the protective cover (6) and the outer wall of the filter cartridge (2). The anti-blowing air flow can pass through the filter holes on the filter cartridge (2) and enter the ash discharge channel (61), rush out and carry the dust deposited in the filter holes towards the ash outlet (16) at the bottom of the machine shell (1); An exhaust port (15) communicating with the suction chamber (12) is provided on the side of the machine shell (1). An air outlet pipe (151) is connected to the exhaust port (15), and the end of the air outlet pipe (151) is connected to a ventilation pipe arranged in the roadway.

2. The dust removal device for roadway tunneling of a rock drilling equipment according to claim 1, characterized in that: A first driving mechanism (3) is provided in the filter cartridge (2); The anti-blowing mechanism (4) further includes a diversion device (43) and a linkage mechanism (44); The annular diversion box (41) is sleeved outside the first driving mechanism (3), and the first driving mechanism (3) can drive the annular diversion box (41) to perform lifting adjustment; The annular diversion box (41) is composed of an annular shell (411) with a cross-section in a horizontally placed U shape and an opening facing outwards and a rotating bushing (412) rotatably installed on the opening of the annular shell (411). An annular diversion cavity (413) is formed between the annular shell (411) and the rotating bushing (412); A plurality of the diversion devices (43) are evenly distributed at the bottom of the annular shell (411), and the nozzles (42) are arranged in an annular array on the rotating bushing (412); The diversion device (43) sucks air into the annular diversion cavity (413) and sprays it out from each nozzle (42) to form an anti-blowing air flow; A linkage mechanism (44) is jointly provided on the first driving mechanism (3) and the annular shell (411) for driving the rotating bushing (412) to rotate and adjust when the annular diversion box (41) moves up and down.

3. The dust removal device for roadway tunneling of a rock drilling equipment according to claim 2, characterized in that: The first driving mechanism (3) includes a first rodless cylinder (31) and a connecting arm (32); The first rodless cylinder (31) is vertically arranged inside the filter cartridge (2), and its bottom is fixedly connected to the bottom sealing end of the filter cartridge (2). The connecting arm (32) is fixed to the side of the first moving seat (311) on the first rodless cylinder (31), and is fixedly connected to the inner edge wall of the annular shell (411).

4. The dust removal device for roadway tunneling of a rock drilling equipment according to claim 3, wherein: The linkage mechanism (44) includes a shaft rod (442), a gear A (443), a toothed ring (444), a gear B (445), and a rack (446). A bracket (441) is fixed to the top of the annular shell (411), and the shaft rod (442) is rotatably installed on the bracket (441) in a penetrating manner. One end of the shaft rod (442) is fixed with the gear A (443), and the other end is fixed with the gear B (445). The toothed ring (444) is fixed to the top of the rotating bushing (412) and meshes with the gear A (443) correspondingly. The rack (446) is vertically fixed to the side of the seat plate of the first rodless cylinder (31) and meshes with the gear B (445) correspondingly.

5. The dust removal device for roadway tunneling of a rock drilling equipment according to claim 2, wherein: Flow guide plates (45) are fixed to the outer side wall of the rotating bushing (412) on one side of each nozzle (42). Each nozzle (42) extends radially along the rotating bushing (412). The flow guide plate (45) extends obliquely relative to the nozzle (42) to obliquely guide the back blowing air flow onto the filter cartridge (2).

6. The dust removal device for roadway tunneling of a rock drilling equipment according to claim 5, wherein: The nozzle (42) is composed of a tapered portion (421) fixed to the rotating bushing (412) and a spraying portion (422) located at the end of the tapered portion (421). The aperture of the spraying portion (422) is smaller than the minimum aperture inside the tapered portion (421). Converging covers (46) are fixed to the flow guide plates (45), and a converging cavity (461) is formed between the converging covers (46) and the flow guide plates (45). The back blowing air flow blown out by the spraying portion (422) can correspondingly enter the converging cavity (461). The span of the converging cavity (461) in the horizontal direction is smaller closer to the filter cartridge (2).

7. The dust removal device for roadway tunneling of a rock drilling equipment according to claim 2, wherein: The flow guiding device (43) includes a mounting cylinder (431) and a suction fan (432). The flow guiding device (43) is fixed to the bottom of the annular shell (411) and is communicated with the annular flow guiding cavity (413). A suction fan (432) is installed in each mounting cylinder (431). A filter screen (433) is arranged below the suction fan (432) in each mounting cylinder (431).

8. The dust removal device for roadway tunneling of a rock drilling equipment according to claim 1, wherein: The cross-section of the shield (6) is shaped such that its bottom is a vertical portion (601) and its top is an arc portion (602); One end of the arc portion (602) is connected to the top of the vertical portion (601), and the other end of the arc portion (602) is movably attached to the outer wall of the filter cartridge (2).

9. The dust removal device for roadway tunneling of a rock drilling device according to claim 1, characterized in that: A second driving mechanism (5) for driving the lifting and adjustment of the shield (6) is provided in the filter chamber (13). The second driving mechanism (5) includes a pair of U-shaped frames each composed of a suspension (52) and two mounting arms (51), and a second rodless cylinder (53) vertically extending and mounted on the two U-shaped frames; Both U-shaped frames are fixed to the inner wall of the casing (1); The shield (6) is fixedly connected to a second moving seat (531) on the second rodless cylinder (53).

10. The dust removal device for roadway tunneling of a rock drilling device according to claim 7, characterized in that: A side opening (101) communicating with the filter chamber (13) is provided on the side of the casing (1), and a door panel (102) for closing the side opening (101) is hingedly mounted on the side of the casing (1); The door panel (102) can be locked by a buckle lock (103) arranged on the casing (1); A dust collection pipe (141) is connected to the ash inlet (14) communicating with the filter chamber (13) on the side of the casing (1), and a dust collection hood (142) is provided at the end of the dust collection pipe (141).

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